benzos, in particular clonazepam
, is a complete waste, as bioavailability is highest (by far) when ingesting them, no need to look any further. Effects will be less when snorted (if present at all, most people stating that the effects are very weak to non-existent when snorting benzos), and it probably will clog up one's nose...useless.
As for IV'ing benzos
, unless one has access to the injectable solution or IV kit (the product plus one or two solvents to be mixed right before injection), it's a complete no-go and might be dangerous from what i understand (as in pushing undissolved solids through your veins dangerous...), for the same reasons snorting is uneffective: most benzos are completely insoluble in water.
Clonazepam is amongst those, there is an injectable solution on the market and it might be ok to IV that, but it is very dangerous, maybe even deadly to inject any other form of clonazepam than that particular preparation.